i think investing in bitcoin its a really slow-proft and semi-safe investement! I mean lets say you buy BTC at 10K and a month or 3 months later goes to 20K...this means you just doubled your investement by trumendous price change which needs a lot of market cap gain to happen!
if you know how make a good research before investing in an altcoin, then an altcoin investemenet can be the most profitable! imagine buying the next coin that will be in the top 10 altcoin when its still at top 80 ranking! if it goes to top 10 you will get the craziest profit of your life x20+ your investement...when with bitcoin you would get only a x2 profit with the same marketcap change!